• monk.liu's avatar
    drm/amdgpu: sync ce and me with SWITCH_BUFFER(2) · 5c3422b0
    monk.liu authored
    we used to adopt wait_reg_mem to let CE wait before DE finish page
    updating, but from Tonga+, CE doesn't support wait_reg_mem package so
    this logic no longer works.
    
    so here is another approach to do same thing:
    Insert two of SWITCH_BUFFER at both front and end of vm_flush can
    guarantee that CE not go further to process IB_const before vm_flush
    done.
    
    Insert two of SWITCH_BUFFER also works on CI, so remove legency method
    to sync CE and ME
    
    v2:
    Insert double SWITCH_BUFFER at front of vm flush as well.
    Signed-off-by: default avatarmonk.liu <monk.liu@amd.com>
    Reviewed-by: default avatarChristian König <christian.koenig@amd.com>
    5c3422b0
amdgpu.h 72.9 KB